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RIS citation export for MOPB13: Active Magnetic Field Compensation System for SRF Cavities

AU - Ding, L.H.
AU - Liang, J.
AU - Liu, H.
AU - Xie, Z.P.
ED - Schaa, Volker RW
TI - Active Magnetic Field Compensation System for SRF Cavities
J2 - Proc. of IBIC2018, Shanghai, China, 9-13 September 2018
C1 - Shanghai, China
T2 - International Beam Instrumentation Conference
T3 - 7
LA - english
AB - Abstract: Superconducting Radio Frequency (SRF) cavities are becoming popular in modern particle accelerators. When the SRF cavity is transitioning from the non-conducting to the Superconducting state at the critical temperature (Tc), the ambient magnetic field can be trapped. This trapped flux may lead to an increase in the surface resistance of the cavity wall, which can reduce the Q-factor and efficiency of the cavity. In order to increase the Q-factor, it is important to lower the surface resistance by reducing the amount of magnetic flux trapped in the cavity wall to sub 10mG range during the Tc transition. In this paper, we present a 3-axis automatic active magnetic field compensation system that is capable of reducing the earth magnetic field and any local disturbance field. Design techniques are described to enhance the system stability while utilizing the flexibility of embedded electronics. This paper describes the system implementation and concludes with initial results of tests. Experimental results demonstrate that the proposed magnetic field compensation system can reduce the earth magnetic field to around 2.5 mG even without shielding.
PB - JACoW Publishing
CP - Geneva, Switzerland
SP - 101
EP - 103
KW - cavity
KW - controls
KW - electron
KW - electronics
DA - 2018/11
PY - 2018
SN - 978-3-95450-201-1
DO - 10.18429/JACoW-IBIC2018-MOPB13
UR - http://jacow.org/ibic2018/papers/mopb13.pdf
ER -